Stitch-cutting machine



April 13 1926.

Y 1,580,429 L. B. FROST STITCH CUTTING MACHINE Filed June 29. 1923 2 Sheets-Sheet 1 L. B. FROST STITCH CUTTING MACHINE April13,1 926.` Y 1,580,429

Filed June 29, 1923 2- Sheets-Sheet 2 fuyant/o2" E0 3 FROJT l T all whom t may concern: t.

Patented Apr. 13, 1926.

'i UNITED; STATES Liso B. FROST, F MARIETTA, oH-Io.

STITCH-,CUTTING iizuicniim.A

Application injeaJvunefas, 192s. Serfin no. e4g,51s.

Be itknown that-I, Liio B. FRosT, -a citizen of the United States, residing aty Marietta, inthe. county ofy Vashington and State lof Ohio, have invented 'a new'l and useful Stitch-'Cutting Machine, of which the fol-l One form of theinventio'ii is ,illustratedl in n the accompanying drawing, in which Figure 1 is a side view and Fig.2 is a sectionalview on thecenter line'A A of Fig. 1. Figure 3 isa front elevation of the machine showing the worktable in position vto receive a shoe welt. Y Y f Important working .parts are. shown in whole or in part in both views and may be referred to andlocated as follows: t

In the drawing,v l represents a suitable housing or casting forming the main stand or frame of the machine. 2 is an yupright plunger guide mountedon the frame. 3 is a ratchet wheel Aarranged lto iiiip-art a reciprocating motion to the plunger, one movenient for each tooth of the wheel. l is an Y adjustable feed table.

and shaft arranged beneath the knife and and plunge-r. 6 is afknife clamped on the plunger andv adjustable vertically thereon for regulating its depth of cut. 7 represents v Y an extension spring connected with the table et and normally tending to hold the feed wheel 5 in contact with 'the sole of the shoe.v

` 8 represents the table spring hook and 9 is which the table is forced down against the tension of tli'e spring 7 to permit the insertion of the shoe welt in position for cutting the, stitches. 10 represents a crank on the end of the shaft supporting the ratchet wheel.` v table having a slot therein through which the knife reciprocates. 12 indicates gears for driving the feed wheel and its shaft from the shaft on which the crank arm l() is mounted. 13 is the plunger spring normally 5 is the feed wheel 11 is the workl tending .to :hold thek plunger in itsjraised positioin` 14 represents thefplunger whereineans `for holding the 'knife on tlielplungen 16 isavrdog arranged -to engage the teeth of Vtothelniife,Gis clamped.V 1,5 is lthe clamping the ratchet wheel. 17 isyali-nk connection 1 9 is a 4pin for holding 4t-h'espring linlplace 'for the gears lrepresents/the ratchet Y' `wheelshaft having the crank 10 on o'iiefenjd and the-.ratchet wheel Son its opposite eiid.

oii the plunger and Q0 lis a washer provided on the shaft of the -feed wheel.

The welt of the shoegis inserted between i t'lie feed wheel and the work table'when the feed table is depressed by the movement of the cam lever. lVhen the welt is properly positioned under the reciprocating knife and is'securely clamped the crank l0 is operated, c

revolving the ratchet wheel and imparting a reciprocating vibratory movement to ,the

plunger and-the knife. blade to sever the welt stitches in succession as the welt is fed. along by the feed wheel shaft so that when the stitches have all been cut the Isole, maybe'V pulled vaway from the upper.

The adjustment fof. the knife ksupport allows it to be posit-ionedso that its cutting edge Will sever the stitches and the. stroke soy of the knife will be checked after the stitch is Vsevered so that the edge'will barely make a mark in the surface of the leather.v In

actual practice in the use of they machine,y

the knife edge makes a slightmark iii the leather not suflicient however, to damage it in any way.

I claim as my invention: y 1. The combination with means for clamping and feeding a shoe welt, of a .welt stitchcutting knife adapted tocut squarely across the' stitches on the, top ofthe welt, and means forreciprocating 'said knife toward and from thel plane of thel welt surface to sever the welt stitches successively and allow them to be drawn out of the welt when the sole is removed.

- 2. The combination with means for clamphaving an up and down movement, a knife adjustably mounted thereon and having a cutting edge for engaging and severing the welt stitches, and means for operating said plunger to engage said knife with the welt stitches,- said cutting edge (pressing the ing and feeding `a shoe welt, of'a plunger n stitches against the welt and severing them squarely and successively as the weltis fed.l

3. The combination With a frame, of a feed table pivoted therein, a feed Wheel mounted in said table, a Work table betWeen Which and said feed table the shoe Welt is clamped, a knife mounted to operate through said Work table at right angles substantially to the Welt to engage and sever the Welt stitches, and mechanism for reciprocating said knife and revolving said feed Wheel simultaneously.

4. The combination With a frame, of a feed table pivoted thereon, a feed Wheel mounted in said table, a Work table, a spring for normally drawing said feed table and feed Wheel toward said Work table, a lever for separating said feed Wheel and Work table against the tension of said spring, a stitch-cutting knife mounted to reciprocate toWard and from said feed Wheel and sever 20 the Welt stitches, and mechanism for reciproeating said knife and operating said feed Wheel.

5. The combination With means for clamping and feeding a shoe Welt, `of a knife havl lng a stitch-cutting edge, a plunger Wherein said knife is mounted, a ratchet Wheel having a series of teeth, means contacting With said teeth for imparting a reciprocating movement to said plunger When said Wheel is revolved and mechanism for operating said Wheel.

6. The combination With means for clamping and feeding a shoe Welt, of a. Welt 'stitchcutting knife, comprising a. blade having a cutting edge and movable toward and from the Welt'to press the stitches against the Welt and sever them transversely and successively, and mechanism for actuating said blade.

LEO B. FROST. 

